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GMR SENSOR WITH "Ni" CONTAINING PINNED AND NANO FERROMAGNETIC LAYERS"

IP.com Disclosure Number: IPCOM000013388D
Original Publication Date: 2000-Jun-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue

IBM

Abstract

GMR sensor structures are disclosed using pinned and free ferromagnetic layers containing an "Ni" ferromagnetic element. The use of "Ni" is desired to improve corrosion resistance and magnetostriction of the free layer. Embodiment 1: Ta/PtMn/CoNi/Ru/CoNi/Cu/CoFeNi/NiFe/Ta CoNi alloy is used in the pinned layer to improve corrosion resistance. The desired concentration of "Ni" is about 5 to 10%. The "Ni" addition in the nanolayer portion of the FREE layer (CoFeNi) helps to make the nanolayer magnetically softer and improves its magnetostriction and corrosion resistance. Embodiment 2: Ta/PtMn/CoNiFe/Ru/CoNiFe/Cu/CoNiFe/NiFe/Ta